A newer building is now connected by an underground passage-way, or just a short block away if you choose to walk at street level (though may mean being harassed by locals). The newer rooms are spacious and modern, and the rooftop offers additional swimming pools and restaurant and bar with great views of the city below.
Parque Central Hotel is a very comfortable stay, but after reading reviews on Tripadvisor it may just depend on which part of the hotel you get your room. Ask for a room in the the new building and you may find the standards are higher than in the original building.
The hotel does offer wifi at 8CUC for one hour, but don't expect it in your room. This is only available in the main foyer and can be charged to your room. This is Cuba, so don't expect to be connected to the world as easily as in the modern world - after all, coming to Cuba is a holiday and a break from it all.
Parque Central Hotel is an excellent hotel in a great location.
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